Source: The Chronicles of Prydain (1964–1968), Book I: The Book of Three (1964), Chapter 1
Context: "Why?" Dallben interrupted. "In some cases," he said, "we learn more by looking for the answer to a question and not finding it than we do from learning the answer itself."
Quotes from book
The Book of Three

The Book of Three is a high fantasy novel by American writer Lloyd Alexander, the first of five volumes in The Chronicles of Prydain. The series follows the adventures of Taran the Assistant Pig-Keeper, a youth raised by Dallben the enchanter, as he nears manhood while helping to resist the forces of Arawn Death-Lord.
“Are you slow-witted? I'm so sorry for you. It's terrible to be dull and stupid.”
Source: The Book of Three
Source: The Chronicles of Prydain (1964–1968), Book I: The Book of Three (1964), Chapter 12
“Most of us are called on to perform tasks far beyond what we believe we can do.”
Author's Note
Source: The Chronicles of Prydain (1964–1968), Book I: The Book of Three (1964)
Context: Most of us are called on to perform tasks far beyond what we believe we can do. Our capabilities seldom match our aspirations, and we are often woefully unprepared. To this extent, we are all Assistant Pig-Keepers at heart.
Source: The Chronicles of Prydain (1964–1968), Book I: The Book of Three (1964), Chapter 13